Revert of Minimize the delegate dependencies for non persistent notifications.

chrome/browser/notifications/notification_handler.h

Index: chrome/browser/notifications/notification_handler.h
diff --git a/chrome/browser/notifications/notification_handler.h b/chrome/browser/notifications/notification_handler.h
index e30f7aec97afd773aeefe14db192f262f9adcfb2..851e76bfebe4b19dddb0dde7dfd490c67758b203 100644
--- a/chrome/browser/notifications/notification_handler.h
+++ b/chrome/browser/notifications/notification_handler.h
@@ -12,6 +12,7 @@
 class NullableString16;
 }
 
+class NotificationDelegate;
 class Profile;
 
 // Interface that enables the different kind of notifications to process
@@ -36,6 +37,10 @@
 
   // Open notification settings.
   virtual void OpenSettings(Profile* profile) = 0;
+
+  // Registers a |delegate| object with this handler.
+  virtual void RegisterNotification(const std::string& notification_id,
+                                    NotificationDelegate* delegate) = 0;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_HANDLER_H_